Presidential observers have observed that President Trump has a "tweet for everything" — meaning that for most of his declarations and behaviors in office, he once sent a tweet criticizing President Obama, his opponents or the media for those exact same things.

This phenomenon is so complete that Trump has even managed to contradict himself on matters as quotidian as ESPN viewership.

One enterprising entrepreneur has created President Flip-Flops, which present Trump's contradictory tweets side by side, one on each foot. They come in three lines: the Electoral College Edition, in which Trump criticizes then praises the Electoral College (guess when and why); the Syria Edition, in which he rails against Obama attacking Syria, then as president advocates for it; and the Sources Edition, in which Trump debates himself on the validity of anonymous sources.

For example:

Trump on Nov. 7, 2012: "The Electoral College is a disaster for democracy."

Trump on Nov. 15, 2016, after losing the popular vote but winning the Electoral College: "The Electoral College is actually genius in that it brings all states, including the smaller ones, into play. Campaigning is much different!"

And also:

Trump on Aug. 6, 2012: "An 'extremely credible source' has called my office and told me that @BarackObama's birth certificate is a fraud."

Trump on Sept. 30, 2016: "Remember, don't believe 'sources said' by the very dishonest media. If they don't name the sources, the sources don't exist."